bonjour
A = ( x - 2 - 6 ) ( x - 2 + 6 ) = ( x - 8 ) ( x + 4 )
B = ( 1 + 2 x + 3 ) ( 1 - 2 x - 3 ) = ( 2 x + 4 ) ( - 2 x - 2 )
C = ( 3 x - 2 + x + 3 ) ( 3 x - 2 - x - 3 ) = ( 4 x + 1 ) ( 2 x - 5 )
D = ( x + 5 + 2 x - 4 ) ( x + 5 - 2 x + 4 ) = ( 3 x + 1 ) ( - x + 9 )
